When an individual decides to undertake a hobby or career in flying, it can open up the world to them in a number of new ways. Learning how to become a responsible, safe, and knowledgeable pilot means grasping a plethora of subjects you may or may not have prior experience with, one of which being meteorology. Weather is always a factor in flight that must be considered as it plays a large part in mitigating risk and being proactive in order to stay ahead of the aircraft. By scrutinizing the current and forecasted conditions, you can determine the flight categories - VFR, MVFR, IFR, or LIFR - at your departure/arrival times, and what is expected (and therefore what to anticipate and how to prepare) along your route. Now let's take a look at some forms of weather information that exist and their details.
METARs
Airports with modern equipment and/or trained personnel publish hourly observations in a METAR (Meteorological
Aerodrome Report) and contain the altimeter setting, wind, ceiling, and other conditions in abbreviated codes, and will include various remarks pertaining to miscellaneous topics including weather trends and updates to runway statuses. A few codes that appear often are listed below, and many that aren't listed make some amount of sense.
CODE | COMPONENT | MEANING |
---|---|---|
CB | Cloud | Cumulonimbus |
A02 | Automated Observation with precipitation discrimination | |
- / + | Intensity | Light / Heavy |
TAFs
A
Terminal
Aerodrome
Forecast, or TAF, is published four times daily - every six hours - and is valid for 24 hours (in some cases, 30 hours). Like METARs, TAFs are comprised of many abbreviation codes for amounts of cloud coverage, wind direction and velocity, etc. which it is essential to familiarize yourself with as a pilot. Unlike METARs, however, a TAF is considered a forecast rather than an observation. TAF reports are also less common than METARs - think KATL, KMGE, and KAHN but not KPDK, KLZU, or KRYY, which have METARs but not TAFs. Some more frequent or more unusual qualifiers one may see are defined in the table below, and most codes are consistent in both METARs and TAFs.
CODE | COMPONENT | MEANING | MEMORY ITEM |
---|---|---|---|
P6SM | Visibility | >6SM | |
BR | Obscuration | Mist | Baby/British Rain |
FU | Obscuration | Smoke | |
UP | Precipitation | Unknown Precipitation |
ATIS, AWOS, ASOS
In addition to the METAR, an airfield's current conditions are updated and broadcasted over the radio, and can be listened to on the frequency found in the chart supplement or on the sectional/en route chart; if the field is towered it will likely have a human-created ATIS at least every hour. The current ATIS will be identified by a phonetic letter. Contrarily, non-towered fields will play AWOS, ASOS, or other automated reports, depending on the equipment, which update more often than ATIS reports.
These are a pilot's primary sources for current and forecasted weather conditions, but there are many places one can obtain weather information at many times before flying, and it is always a good idea to try to look at the big picture as well as the details. Understanding weather, how/when to obtain it, and it's implications is a skill and area of knowledge of paramount importance for any pilot who prioritizes safety. This also makes it important to be well-versed in your aircraft's limitations and is a large function of preflight planning. Officially, weather can be gathered from the National Weather Service, a website we recommend every aviator bookmarks or saves for easy, quick, and frequent access.
Weather often creates challenging Go/No-Go decisions and calls for a pilot to exercise their Personal Minimums in real-world practice. Err on the side of caution if you're ever unsure or uncomfortable, and there is no need to jeopardize safety at any point. As they say, it is better to be on the ground wishing you were in the air, than the other way around.
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